Recent questions tagged 3-phase

1 answer 35 views

Define phase sequence of three phase supply with waveforms. What is normal phase sequence? Which 3 standard colours are used to denote the phase sequence?

asked Aug 11, 2018 in Basic electrical and electronics engineering by Quiz
1 answer 14 views

Which of the following 3-phase connection of a transformer causes interference with the neighbouring communication lines:  (A) Delta-Star (B) Star-Delta (C) Delta-Delta (D) Star-Star

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 79 views

A 3-phase voltage source inverter operates in 180° conduction mode with a star connected resistive load. If input dc voltage is 100 V, then the peak to peak output line voltage is :

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 14 views

Two 3-phase transformers cannot be operated in parallel, if their :  (A) kVAs are different (B) phase sequences are different (C) % impedances are different (D) voltage ratios are different

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 30 views

Damper winding is provided in 3 phase synchronous motors to :

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 20 views

The direction of rotation of an inverter fed 3-phase ac motor is reversed by (A) a mechanical reversing switch (B) reversing the input dc link voltage (C) operating the inverter as a rectifier (D) changing the sequence of switching

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123
1 answer 283 views

The sequence components of current of a single-phase load connected to a 3-phase system are (A) equal positive and negative sequence components (B) equal positive, negative and zero sequence components (C) vector sum of sequence currents is zero (D) algebraic sum of sequence currents is zero

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 18 views

The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min (A) 100 rpm (B) 200 rpm (C) 400 rpm (D) 800 rpm

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 33 views

In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in (A) voltage notching (B) harmonic distortion (C) voltage sag (D) voltage swell

asked Apr 28, 2018 in Electronics Engineering by Shimroz123
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